cgi scripts fail to run from userdir with "End of script output before headers" errors
James McDonald
james at jamesmcdonald.id.au
Thu Oct 9 18:58:22 PDT 2014
Not something silly like having 700 set on /home/user or below ?
Still using suexec what does suexec -V say?
On 10 October 2014 12:40, David A. Bandel <david.bandel at gmail.com> wrote:
> Lonnie,
>
> Well, I believe you still need a "required" line in the
> /home/*/public_html/ directory portion, but I'm running out of ideas.
>
> 1. Are you using apparmor? If so, kill it.
>
> Try this for your userdir.conf:
> <IfModule mod_userdir.c>
> UserDir public_html
> UserDir disabled root
> AddHandler cgi-script .cgi .pl
> <Directory /home/*/public_html>
> AllowOverride FileInfo AuthConfig Limit Indexes
> Options Includes MultiViews Indexes SymLinksIfOwnerMatch
> Require all granted
> </Directory>
> <Directory /home/*/public_html/cgi-bin>
> AllowOverride FileInfo AuthConfig Limit Indexes
> Options ExecCGI Includes MultiViews SymLinksIfOwnerMatch
> Require all granted
> </IfModule>
>
> If the above doesn't work, try accessing from your browser via your
> hostname vice localhost (if no DNS for the hostname, just add to
> /etc/hosts).
>
> Starting to run low on ideas ...
>
> David-
>
>
> On Thu, Oct 9, 2014 at 10:52 AM, Lonni J Friedman <netllama at gmail.com>
> wrote:
>
>> I made the changes that you recommended, restarted apache, but it
>> didn't help. Still getting the same cryptic error. I've attached
>> userdir.conf with the changes, in case I somehow screwed it up.
>>
>> thanks
>>
>> On Wed, Oct 8, 2014 at 7:21 PM, David A. Bandel <david.bandel at gmail.com>
>> wrote:
>> > Lonnie,
>> >
>> > I see two glaring errors:
>> > 1. no ScriptAlias directive in the userdir.conf file (see main file for
>> > use)
>> > 2. The file set up the userdir area read-only. In the cgi-bin stanza,
>> you
>> > need:
>> > Require all granted (in 2.4 the two lines Order Allow Deny and Allow
>> from
>> > all became the one Require line -- it's also more flexible)
>> > The stanza for the directory above it has Require method GET POST
>> OPTIONS
>> > which locks this area and subdirectories down
>> >
>> > You might want to remove Indexes from your cgi-bin area. Do you really
>> want
>> > folks to be able to get a directory listing of the cgi-bin directory?
>> (no,
>> > you really don't)
>> >
>> > With those changes and a reload, it should work.
>> >
>> > Before you go production, make sure you remove the cgitb (cgi trace
>> back)
>> > module. No sense giving the bad guys more ammo.
>> >
>> > David-
>> >
>> > On Wed, Oct 8, 2014 at 2:11 PM, Lonni J Friedman <netllama at gmail.com>
>> wrote:
>> >>
>> >> That's correct, the script works just fine when in /var/www/cgi-bin.
>> >> mod_cgi is explicitly loaded.
>> >>
>> >> I've attached my config files. userdir.conf & 01-cgi.conf are
>> >> included from httpd.conf.
>> >>
>> >> On Wed, Oct 8, 2014 at 12:06 PM, David A. Bandel <
>> david.bandel at gmail.com>
>> >> wrote:
>> >> > Lonnie,
>> >> >
>> >> > OK, there must be a global configuration that's preventing this
>> script
>> >> > from
>> >> > running. Can you post your entire config file? If you don't want
>> to do
>> >> > that, I can provide an alternate means to pass it to me. Also, you
>> said
>> >> > these run if you put them in your global cgi-bin directory, just not
>> as
>> >> > a
>> >> > user, correct? So mod_cgi is loaded (please confirm).
>> >> >
>> >> > David-
>> >> >
>> >> > On Wed, Oct 8, 2014 at 12:34 PM, Lonni J Friedman <
>> netllama at gmail.com>
>> >> > wrote:
>> >> >>
>> >> >> I saved the script in /home/netllama/public_html/cgi-bin/m.py, made
>> it
>> >> >> executable for everyone, and ran it manually:
>> >> >>
>> >> >> [netllama at netllama cgi-bin]$ ./m.py
>> >> >> Content-Type: text/plain;charset=utf-8
>> >> >>
>> >> >> Hello World!
>> >> >>
>> >> >>
>> >> >> I then attempted to call it from firefox, and I saw another 500
>> >> >> Internal Server Error:
>> >> >> [Wed Oct 08 10:32:06.977104 2014] [cgi:error] [pid 26629] [client
>> >> >> 127.0.0.1:59320] End of script output before headers: m.py
>> >> >>
>> >> >>
>> >> >> I've already got the SetHandler in the config:
>> >> >> <Directory /home/*/public_html/cgi-bin>
>> >> >> AllowOverride Indexes AuthConfig
>> >> >> Options ExecCGI FollowSymLinks
>> >> >> SetHandler cgi-script
>> >> >> AddHandler cgi-script .py
>> >> >> </Directory>
>> >> >>
>> >> >> I'm using apache-2.4.10.
>> >> >>
>> >> >>
>> >> >> On Tue, Oct 7, 2014 at 7:26 PM, David A. Bandel
>> >> >> <david.bandel at gmail.com>
>> >> >> wrote:
>> >> >> > Lonnie,
>> >> >> >
>> >> >> > Phew -- yep, this is why I hate this error.
>> >> >> >
>> >> >> > Try this:
>> >> >> > /----start of script----/
>> >> >> > #!/usr/bin/env python
>> >> >> > # -*- coding: UTF-8 -*-
>> >> >> >
>> >> >> > # enable debugging
>> >> >> > import cgitb
>> >> >> > cgitb.enable()
>> >> >> >
>> >> >> > print "Content-Type: text/plain;charset=utf-8"
>> >> >> > print
>> >> >> >
>> >> >> > print "Hello World!"
>> >> >> >
>> >> >> > ----/end of script/----
>> >> >> >
>> >> >> > Your script and this one (call it test.py) should both be
>> executable,
>> >> >> > owned
>> >> >> > by the same user, and in the user's cgi-bin directory.
>> >> >> >
>> >> >> > Ensure you can run both from the command line, then try to run
>> them
>> >> >> > in
>> >> >> > apache by connecting with a browser.
>> >> >> >
>> >> >> > If test.py works, but your foo.py script doesn't, the problem is
>> in
>> >> >> > your
>> >> >> > foo.py script. Make sure your script is outputting a content-type
>> >> >> > line
>> >> >> > (see
>> >> >> > above).
>> >> >> >
>> >> >> > If the test.py does not work, we have a configuration issue.
>> >> >> >
>> >> >> > Could also add a "SetHandler: cgi-script" to your cgi-directory
>> >> >> > stanza.
>> >> >> >
>> >> >> > BTW: which version of apache? 2.2 or 2.4 (some declarations
>> changed
>> >> >> > between
>> >> >> > these two version numbers)
>> >> >> >
>> >> >> >
>> >> >> > David-
>> >> >> >
>> >> >> >
>> >> >> > On Tue, Oct 7, 2014 at 6:17 PM, Lonni J Friedman <
>> netllama at gmail.com>
>> >> >> > wrote:
>> >> >> >>
>> >> >> >> I definitely have suexec enabled:
>> >> >> >> [Mon Oct 06 16:09:31.518777 2014] [suexec:notice] [pid 20128]
>> >> >> >> AH01232:
>> >> >> >> suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
>> >> >> >>
>> >> >> >> Renaming the suexec binary, and retrying didn't really help:
>> >> >> >> [Tue Oct 07 16:17:15.854011 2014] [cgi:error] [pid 26631] [client
>> >> >> >> 127.0.0.1:55657] AH01215: (2)No such file or directory: exec of
>> >> >> >> '/usr/sbin/suexec' failed
>> >> >> >> [Tue Oct 07 16:17:15.854671 2014] [cgi:error] [pid 26631] [client
>> >> >> >> 127.0.0.1:55657] End of script output before headers: foo.py
>> >> >> >>
>> >> >> >> I added a handler to the "<Directory
>> /home/*/public_html/cgi-bin>"
>> >> >> >> section of my apache config, but that didn't have any impact on
>> the
>> >> >> >> problem.
>> >> >> >>
>> >> >> >> Any other suggestions?
>> >> >> >>
>> >> >> >>
>> >> >> >> On Tue, Oct 7, 2014 at 6:28 AM, David A. Bandel
>> >> >> >> <david.bandel at gmail.com>
>> >> >> >> wrote:
>> >> >> >> > Lonnie,
>> >> >> >> >
>> >> >> >> > With or without suexec, you will need a handler line:
>> >> >> >> > AddHandler cgi-script .cgi .py
>> >> >> >> > (make sure the above line has the pertinent extension, like .py
>> >> >> >> > and
>> >> >> >> > your
>> >> >> >> > python script ends in .py)
>> >> >> >> >
>> >> >> >> > If using suexec, you should see a line in your error_log:
>> >> >> >> > suEXEC mechanism enabled
>> >> >> >> >
>> >> >> >> > Your script must be runable by suEXEC user. You might find it
>> >> >> >> > easier
>> >> >> >> > to
>> >> >> >> > disable suexec (unless you need it). Just rename the suexec
>> >> >> >> > script
>> >> >> >> > and
>> >> >> >> > restart apache and test. If you the script works but you need
>> >> >> >> > suexec
>> >> >> >> > (because you're going to have lots of users that need to run
>> CGI
>> >> >> >> > scripts),
>> >> >> >> > then you'll need to troubleshoot the suexec mess.
>> >> >> >> >
>> >> >> >> > David-
>> >> >> >> >
>> >> >> >> > On Mon, Oct 6, 2014 at 8:55 PM, Lonni J Friedman
>> >> >> >> > <netllama at gmail.com>
>> >> >> >> > wrote:
>> >> >> >> >>
>> >> >> >> >> Hi David,
>> >> >> >> >> I was actually leaning towards some kind of apache
>> configuration
>> >> >> >> >> issue, but clearly i'm not the expert here, or I would have
>> >> >> >> >> figured
>> >> >> >> >> it
>> >> >> >> >> out myself :)
>> >> >> >> >>
>> >> >> >> >> To answer your questions:
>> >> >> >> >> Its a python script that I'm trying to run.
>> >> >> >> >> $HOME is on the same partition as / (which is the same
>> partition
>> >> >> >> >> as
>> >> >> >> >> the apache $DOCROOT). Its all on a development system, not
>> >> >> >> >> anything
>> >> >> >> >> resembling production.
>> >> >> >> >> The user's UID is greater than 1000.
>> >> >> >> >> I am using suexec.
>> >> >> >> >>
>> >> >> >> >> I'd be happy to answer any other questions.
>> >> >> >> >>
>> >> >> >> >> thanks
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >> On Mon, Oct 6, 2014 at 6:45 PM, David A. Bandel
>> >> >> >> >> <david.bandel at gmail.com>
>> >> >> >> >> wrote:
>> >> >> >> >> > Lonnie,
>> >> >> >> >> >
>> >> >> >> >> > This is one of the most annoying, frustrating errors. All
>> it
>> >> >> >> >> > says
>> >> >> >> >> > is
>> >> >> >> >> > that
>> >> >> >> >> > the script didn't work. This may be permissions. It may be
>> >> >> >> >> > your
>> >> >> >> >> > $HOME
>> >> >> >> >> > mount is non-executable. Difficult to say. You didn't say
>> >> >> >> >> > what
>> >> >> >> >> > kind
>> >> >> >> >> > of
>> >> >> >> >> > script it was (Perl, PHP, shell). Is the UID of the user
>> >> >> >> >> > greater
>> >> >> >> >> > than
>> >> >> >> >> > 1000?
>> >> >> >> >> > Are you using suexec?
>> >> >> >> >> >
>> >> >> >> >> > I hate this error. Will be either one of the permissions
>> >> >> >> >> > issues
>> >> >> >> >> > above
>> >> >> >> >> > or
>> >> >> >> >> > some Apache configuration issue (I'm betting on
>> permissions).
>> >> >> >> >> >
>> >> >> >> >> > David-
>> >> >> >> >> >
>> >> >> >> >> > On Mon, Oct 6, 2014 at 5:57 PM, Lonni J Friedman
>> >> >> >> >> > <netllama at gmail.com>
>> >> >> >> >> > wrote:
>> >> >> >> >> >>
>> >> >> >> >> >> Howdy folks,
>> >> >> >> >> >> Any cgi/apach experts still around? I'm trying to get cgi
>> >> >> >> >> >> scripts
>> >> >> >> >> >> working from $USERDIR on a new Fedora system, and they all
>> >> >> >> >> >> fail
>> >> >> >> >> >> with
>> >> >> >> >> >> internal server errors. In the apache error log, I see:
>> >> >> >> >> >> [cgi:error] End of script output before headers
>> >> >> >> >> >>
>> >> >> >> >> >> If I copy the script over to the server $DOCROOT/cgi-bin
>> then
>> >> >> >> >> >> it
>> >> >> >> >> >> runs
>> >> >> >> >> >> just fine. So this proves the script itself isn't the
>> >> >> >> >> >> problem.
>> >> >> >> >> >> Additionally, non-cgi scripts are served just fine from
>> >> >> >> >> >> $USERDIR.
>> >> >> >> >> >> Both the cgi-bin directory and the script itself are
>> >> >> >> >> >> executable
>> >> >> >> >> >> for
>> >> >> >> >> >> all users (755). This is what I've got set in the apache
>> >> >> >> >> >> config
>> >> >> >> >> >> for
>> >> >> >> >> >> the USERDIR directory structure:
>> >> >> >> >> >>
>> >> >> >> >> >> <Directory "/home/*/public_html">
>> >> >> >> >> >> AllowOverride FileInfo AuthConfig Limit Indexes
>> >> >> >> >> >> Options MultiViews Indexes SymLinksIfOwnerMatch ExecCGI
>> >> >> >> >> >> Require method GET POST OPTIONS
>> >> >> >> >> >> </Directory>
>> >> >> >> >> >>
>> >> >> >> >> >> <Directory /home/*/public_html/cgi-bin>
>> >> >> >> >> >> AllowOverride Indexes AuthConfig
>> >> >> >> >> >> Options ExecCGI
>> >> >> >> >> >> SetHandler cgi-script
>> >> >> >> >> >> </Directory>
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >> >> Anyone know what I'm missing?
>> >> >> >> >> >>
>> >> >> >> >> >> thanks
>> >> >> >> >>
>>
>>
>> --
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> L. Friedman netllama at gmail.com
>> LlamaLand http://netllama.linux-sxs.org
>>
>> _______________________________________________
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>>
>>
>
>
> --
> Two things are infinite: the universe and human stupidity; and I'm not
> sure about the the universe. -- Albert Einstein
> Visit my web page at: http://david.bandel.us/
>
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